| A | B |
|---|
| load arm | the distance from the fulcrum to the load on the lever |
| newton | metric unit of force |
| gear | a wheel with teeth |
| force | a push or pull |
| friction | a force that slows the motion of an object |
| fulcrum | the turning point of a lever |
| lubrication | a way of reducing friction by using a liquid on the moving parts |
| spring scale | a device to measure force |
| compound machine | a machine made up of two or more simple machines |
| force arm | the distance from the fulcrum to the force on a lever |
| pulley | a wheel with a rope moving around it |
| fixed | a pulley that stays in place as the load moves |
| gear | a wheel with teeth |
| machine | anything that makes work easier |
| spring | scale is used to measure force |
| load | the object to be moved or lifted by a lever |
| pitch | the distance between two threads in a screw |
